Colloidal Silver

Colloidal silver is used for its antimicrobial/“soothing” positioning, but evidence for skin benefit is limited and it can provoke irritant or allergic contact dermatitis in a minority of users, especially with compromised barriers (e.g., eczema) and repeated leave-on exposure. At typical OTC topical use levels, most people tolerate it, yet clinical patch-testing and case reports support a non-trivial sensitivity risk, so I rate it as mild rather than gentle for patient safety. Safety Notes: In consumer OTC skincare, colloidal silver is typically dosed very low because it is marketed as an antimicrobial/soothing additive and is often disclosed as ppm-level silver in aqueous sprays, toners, gels, and creams (e.g., ~1–10 ppm elemental silver ≈ 0.0001–0.001%). High-strength niche products (silver gels/creams, wound-care-inspired OTC skin gels, and some anti-blemish spot products) can reach roughly 100–500 ppm silver (≈ 0.01–0.05%), which is about the upper end seen in general retail before moving into regulated medical devices/pro-only uses. Leave-on products dominate these use levels; rinse-off products generally sit at the lower end due to limited contact time and cost/benefit.